The less energy you use to lift the weight, the more time it takes to move that weight; if it takes you 10 times as long to generate the energy as it does to

The less energy you use to lift the weight, the more time it takes to move that weight; if it takes you 10 times as long to generate the energy as it does to use it, then you're going to need massive generation capacity to get anything appreciable happening in a reasonable time frame.